CVE-2021-21259

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.36% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 71.4% of scored records. A rank, not a probability.

NVD base score

6.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-01-22 17:10Z5 YR AGO

Last updated

2024-08-03 18:09Z2 YR AGO

Reserved

2020-12-22

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.4)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.1

Document digest

4b47059a93cc43d27e363e2e9f3a7733755693221bdfc4541021851dae4e518c

• github.comhttps://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-44w9-vm8p-3cxwx_refsource_CONFIRM
• github.comhttps://github.com/hedgedoc/hedgedoc/releases/tag/1.7.2x_refsource_MISC
• github.comhttps://github.com/hedgedoc/hedgedoc/commit/35b0d39a12aa35f27fba8c1f50b1886706e7efefx_refsource_MISC
• github.comhttps://github.com/hackmdio/codimd/issues/1648x_refsource_MISC